Research In Compensation Method Of Hysteresis In Magnetorheological Damper For Impact Buffer

As a new type of intelligent material,magnetorheological fluid(MRF)whose yield stress and viscosity strengthen when subjected to electric field or magnetic field is widely used in the field of vibration and noise reduction,vibration isolation under random loads,and some other fields.However,the inherent hysteresis nonlinearity of MR damper limits its wide application in engineering and greatly affects the prediction and control accuracy of damper damping force.Especially in the impact buffer system,the hysteresis characteristics of MR damper are particularly prominent.Therefore,it is of great significance to study the Compensation of hysteresis nonlinearity and the control of MR damper to improve the control performance of MR damper system.In this paper,the magnetorheological dampers for shock buffering are studied.The theory and method of hysteresis control are studied in depth.The purpose is to compensate the effect of hysteresis on the control system and realize the accuracy control of MR dampers.In this paper,we use theoretical analysis,modeling and simulation and experimental verification methods to study the hysteresis nonlinearity of MR damper,and the main contents are summarized as follows:(1)In view of the magnetic hysteresis of MRD,the Hall sensors are used to measure the magnetic induction intensity,and the selection of the sensor and the installation in the damper are introduced.The mechanical mathematical formula of the magnetorheological damper is derived according to the Bingham model.The force is composed of viscous damping force which is independent of the intensity of the magnetic field and the Coulomb damping force which can be controlled by the external magnetic field.According to the ~ characteristic of the magnetorheological fluid,the relationship curve between and is obtained.(2)The hysteresis phenomenon of the magnetorheological damper is simulated by the JilesAtherton model,and the J-A model equation based on the Simulink module is constructed,and the accurate hysteresis loop of the B-I is obtained by solving the model equation.At the same time,the hysteresis characteristics of magnetorheological damper are tested by using LabVIEW,and the existence of hysteresis nonlinearity is verified.For the measured B-I data,the PSO algorithm is used to identify the 5 parameters of the J-A model.(3)Taking the ideal Coulomb damping force as input and considering the frequency of input signals,the effect of hysteresis compensation control simulation with the open-loop control and the PID control are compared.The experiment of magnetic hysteresis compensation control for the magnetorheological damper is carried out by the LabVIEW software.The results show that the control algorithm is effective and better.(4)On the basis of the magnetorheological damper dynamic model and the J-A hysteresis model,and according to the control target and the characteristics of the impact load,the real-time buffer control and simulation system for MRD using the open-loop,PID and fractional P under the impact load are established in Simulink.The control effect of the damper is compared,PID and fractional P can achieve the "platform effect" in a certain buffer process,which can achieve the impact buffer effect well,especially the fractionalP.The validity of fractional Palgorithm is verified.Moreover,it verifies that the control method of the hysteresis compensation for magnetorheological damper under impact loadings is feasible.